The MAX221 is a +5V-powered, single transmit/receive RS-232 and V.28 communications interface with auto- matic shutdown/wake-up features and high data rate capabilities.
The MAX221 is a +5 V‑powered, single‑channel RS‑232 and V.28 communications interface that incorporates Maxim’s AutoShutdown feature. In normal operation it provides a guaranteed 250 kbps data rate while consuming only 1 µA when the receiver input is idle.
The device is supplied in a 16‑pin TSSOP or SSOP package and operates from –40 °C to +85 °C (MAX221E). It is intended for maintenance/diagnostic ports, industrial systems, telecommunications equipment, and set‑top boxes, and includes pins for forced on/off control and an INVALID output for software‑controlled shutdown.
| Supply Voltage (VCC) | 4.5 V to 5.5 V |
|---|---|
| Supply Current (AutoShutdown) | 1 µA |
| Maximum Data Rate | 250 kbps |
| Package | 16‑pin TSSOP / SSOP |
| Operating Temperature Range | -40 °C to +85 °C |
| AutoShutdown Feature | Enables 1 µA standby current |
The MAX221 draws only 1 µA in AutoShutdown mode.
It shuts down when no valid signal is detected on the receiver input for at least 30 µs.
The FORCEON pin forces the transmitter and charge pump on, while the FORCEOFF pin forces them off.